How did conquests contribute to the growth of well organized empires?

Different conquests of well organized empires have contributed to its growth through the change of its administration and different systems like roads, trading, ports, and even the military and navy units.  Some example of these are the Persian empire which was able to have royal roads and relay station and Alexanders empire that was able to built new routes after the conquests.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

assessment is the missing word